Improved method and apparatus for up- and down- conversion...

Details Improved method and apparatus for up- and down- conversion... Improved method and apparatus for up- and down- conversion...

H - Electricity

04

B

H04B 1/26 (2006.01) H03D 3/00 (2006.01) H03D 7/16 (2006.01) H04B 1/28 (2006.01) H04B 1/30 (2006.01)

Patent

CA 2381999

This patent describes a method and system which overcomes the LO-leakage problem of direct conversion and similar RF transmitters and receivers. To solve this problem a virtual LO.TM. signal is generated which emulates mixing with a local oscillator (LO) signal. However, the virtual local oscillator (VLO) signal is constructed using signals that do not contain a significant amount of power (or no power at all) at the wanted output RF frequency, so there is no LO component to leak to the output. The invention also does not require sophisticated filters or large capacitors as other designs in the art, so it is fully integratable.

La présente invention concerne un procédé et un système qui vient à bout du problème des fuites d'oscillateur local des émetteurs et récepteurs radio à conversion directe et analogues. A cet effet, on génère un signal d'oscillateur local virtuel qui joue le rôle du mélange avec un signal d'oscillateur local. Toutefois, le signal de l'oscillateur local virtuel est construit à base de signaux qui ne véhiculent quasiment ou absolument par d'énergie pour le niveau de fréquence de sortie radio voulu. Il en résulte une absence de composante d'oscillateur local en fuite dans la sortie. L'invention ne nécessitant ainsi aucun filtre compliqué ni aucun condensateur de grande capacité comme dans le cas des autres conceptions, elle se prête totalement à l'intégration.

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